Method for producing optical component, method for producing product including touch sensor, optical component, and touch sensor device

ABSTRACT

A method for producing an at least partially transparent optical component including a laminate including fabricating a precursor laminate by bonding a transparent substrate and a transparent film to each other with a transparent photocurable adhesive layer interposed therebetween; curing the transparent photocurable adhesive layer by applying light thereto to change the precursor laminate into the laminate thereby, such that a shear modulus G′ of the transparent photocurable adhesive layer of the laminate measured under a condition of a temperature of 25° C. and a frequency of 1 Hz reaches a value within a range of 3×10 5  Pa≤G′≤3×10 7  Pa; and forming a flush and surface of the laminate by cutting the laminate in a thickness direction, such that the flush end surface includes respective cut surfaces of the transparent film, the transparent photocurable adhesive layer, and the transparent substrate.

TECHNICAL FIELD

The present invention relates to an optical component used as a coverprovided on, for example, a contact input surface of a touch sensor anda method for producing the optical component, and also relates to atouch sensor device and a method for producing a product including atouch sensor.

BACKGROUND ART

FIG. 1 shows a cross sectional structure of a portable electronic devicedescribed in Japanese Patent Application Laid Open No. 2014-160473(published on Sep. 4, 2014, hereinafter referred to as Literature 1) asan example of a configuration including such the optical component. Theportable electronic device includes a casing 11, an insert plate 12, aconductive cushion 13, a touch panel controller 14, a backlight 15, aliquid crystal display part 16, a touch panel part 17, a cover glass 18,an antiscattering film 19, an adhesive 20, a shield ground 21, and abattery 22.

In the configuration in FIG. 1, the cover glass 18 protects the touchpanel part 17, and the antiscattering film 19 protects the cover glass18 so as to prevent scattering of glass pieces when the cover glass 18is broken. In this example, the cover glass 18 and the antiscatteringfilm 19 are laminated on an upper surface (contact input surface) of thetouch panel part 17.

The cover glass 18 and the antiscattering film 19 are fixed by theadhesive 20, and in this example, the cover glass 18 and theantiscattering film 19 have the same size.

SUMMARY OF THE INVENTION

As described above, in Literature 1, the optical component composed of alaminate including three layers: the cover glass 18, the adhesive 20,and the antiscattering film 19 is provided on the contact input surfaceof the touch panel part 17. The cover glass 18 and the antiscatteringfilm 19 have the same size, and the laminate of the three-layerstructure has flush end surfaces formed of end surfaces of the coverglass 18, the adhesive 20, and the antiscattering film 19 flush witheach other.

However, in an optical component composed of a laminate formed bybonding a transparent substrate and a transparent film to each otherwith a layer of an adhesive interposed therebetween like the opticalcomponent composed of the laminate of the three-layer structuredescribed in Literature 1, it is not easy but troublesome to accuratelyalign and bond the three layers together so that the laminate has flushend surfaces, resulting in low production efficiency.

On the other hand, for example, if a film having a smaller size (area)than a substrate is used and three layers are bonded together withoutrequiring end surfaces flush with each other, production efficiencyimproves. However, a peripheral edge of a substrate surface partiallydoes not have the film, which impairs uniformity of the surface of anoptical component and reduces visual quality of the optical component.

Then, to obtain flush end surfaces with high production efficiency in anoptical component composed of a laminate of a three-layer structure, itcan be considered that the laminate including three layers is cut in athickness direction by one cutting step to form flush end surfaces.

However, in the optical component composed of the laminate fabricated inthis manner, a cut surface of an adhesive layer is exposed on the endsurface. Thus, in a step of assembling a touch sensor device or aproduct including a touch sensor by incorporating the optical component,an operator may touch the end surface of the optical component duringhandling, thereby causing a small piece of the layer of the adhesive topeel or fall off, or causing quality deterioration or a defect such asforeign matter adhering to the cut surface or further a film beingpeeled from an end. In addition, the layer of the adhesive is flexibleand is hard to cut.

In view of these problems, the present invention has an object toprovide a method for producing an optical component composed of alaminate having a flush end surface, without an exposed adhesive layercausing various defects in a subsequent assembling step of a product,and a method for producing a product including a touch sensor, and alsoprovide an optical component and a touch sensor device.

According to the present invention, a method for producing an at leastpartially transparent optical component including a laminate comprises:a step of fabricating a precursor laminate by bonding a transparentsubstrate and a transparent film to each other with a transparentphotocurable adhesive layer interposed therebetween; a step of curingthe transparent photocurable adhesive layer by applying light thereto tochange the precursor laminate into the laminate thereby, such that ashear modulus G′ of the transparent photocurable adhesive layer of thelaminate measured under a condition of a temperature of 25° C. and afrequency of 1 Hz reaches a value within a range of 3×10⁵ Pa≤G′≤3×10⁷Pa; and a step of forming a flush and surface of the laminate by cuttingthe laminate in a thickness direction, such that the flush end surfaceincludes respective cut surfaces of the transparent film, thetransparent photocurable adhesive layer, and the transparent substrate.

A method for producing a product including a touch sensor according tothe present invention comprises a step of bonding the optical componentproduced by the method for producing the optical component describedabove and the touch sensor or a device including the touch sensor toeach other with another transparent adhesive layer therebetween.

According to a first aspect of the present invention, in an opticalcomponent comprising a laminate, the laminate including a transparentsubstrate, a transparent adhesive layer, and a transparent film stackedin this order, the transparent adhesive layer includes both a first typeof crosslinking and a second type of crosslinking of (meta)acrylicpolymer, the first type of crosslinking being formed of a first reactionsite selected from a first group consisting of: a hydroxyl group, acarboxyl group, and an amino group, and a second reaction site selectedfrom a second group consisting of: an isocyanate group, an epoxy group,and a metal atom, and the second type of crosslinking being formed byaddition polymerization of unsaturated double bond, and an end surfaceof the laminate includes respective the cut surfaces of the transparentfilm, the transparent adhesive layer, and the transparent substrateflush with each other.

According to a second aspect of the present invention, in an opticalcomponent comprising a laminate, the laminate including a transparentsubstrate, a transparent adhesive layer, and a transparent film stackedin this order, the transparent adhesive layer contains (meta)acrylicpolymer crosslinked with multifunctional (meta)acrylate, a shear modulusG′ of the transparent adhesive layer measured under a condition of atemperature of 25° C. and a frequency of 1 Hz is within 3×10⁵Pa≤G′≤3×10⁷ Pa, and an end surface of the laminate includes respectivethe cut surfaces of the transparent film, the transparent adhesivelayer, and the transparent substrate flush with each other.

A touch sensor device according to the present invention comprises astructure in which any of the optical components described above and atouch sensor or a device including a touch sensor are joined to eachother with another transparent adhesive layer interposed therebetween.

According to the present invention, the optical component composed ofthe laminate including the film, the adhesive layer, and the substrateand having the flush end surface can be successfully produced. Althoughthe end surface of the adhesive layer is exposed, an operator touchingthe end surface does not cause a small piece of the adhesive layer topeel or fall off, and does not cause a defect such as foreign matteradhering to the end surface or the film being peeled from an end.

This allows a touch sensor device or a product including a touch sensorto be subsequently successfully assembled.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates an example of a conventional configuration of anoptical component;

FIG. 2 is a plan view of an embodiment of an optical component accordingto the present invention;

FIG. 3A illustrates a cross-sectional structure of the optical componentin FIG. 2;

FIG. 3B illustrates another cross-sectional structure of the opticalcomponent;

FIG. 4 is a table showing a relationship between a value of a shearmodulus G′ and a property of an adhesive layer;

FIG. 5 is a cross-sectional view of an embodiment of a touch sensordevice according to the present invention; and

FIG. 6 is a cross-sectional view of another embodiment of a touch sensordevice according to the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Embodiments of the present invention will now be described.

FIG. 2 shows a brief appearance of a cover provided on a contact inputsurface of a touch sensor as an embodiment of an optical component ofthe present invention. FIG. 3A shows a cross-sectional structurethereof. In FIG. 3A, thicknesses of components of the cover areexaggerated.

A cover 30 is composed of a laminate 34 including a transparentsubstrate 31, a transparent adhesive layer 32, and a transparent film 33stacked in this order, and further includes a light blocking design part35 in this example. In this example, the design part 35 is formed on aperipheral edge of a surface of the substrate 31 opposite to a surfacefacing the film 33. In FIG. 2, a portion with the design part 35 ishatched, and the contact input surface of the touch sensor is positionedin a transparent region 36 within the frame-like design part 35. In FIG.2, reference numerals 37, 38 denote holes extending through the cover 30and in which push buttons or the like are disposed.

In the cover 30 having the configuration as described above, thesubstrate 31 basically serves to protect the touch sensor, and the film33 basically serves as an antiscattering film that prevents scatteringof broken pieces when the substrate 31 is broken.

The substrate 31 is made of glass or resin, and the film 33 is made ofpolyethylene terephthalate (PET), triacetylcellulose (TAC), cycloolefinpolymer (COP), or the like. A glass film may be used as the film 33. Theadhesive layer 32 is a photocurable adhesive layer containing(meta)acrylic polymer.

The present invention has a feature in that the photocurable adhesivelayer containing (meta)acrylic polymer is moderately cured, and a shearmodulus (storage modulus) G′ is used as an index of a curing state.

Experimental results will be described here on changes of properties ofthe photocurable adhesive layer such as stickiness of the photocurableadhesive layer, peeling and falling caused by an operator touching thephotocurable adhesive layer and further adhesion to an object to beadhered to as a function of the value of the shear modulus G′.Measurement conditions (dynamic viscoelasticity measurement conditions)of the shear modulus G′ are as described below:

Measurement temperature range: −40 to +140° C.

Temperature increasing speed: +3° C./min

Measurement temperature: 25° C.

Strain: 1%

Frequency: 1 Hz

Jig: parallel plate ϕ25 mm

Sample thickness: 400 to 600 μm

Specifically, the value of the shear modulus G′ is a measurement valueat the measurement temperature (25° C.) in a process of measurementwhile changing the measurement temperature range (−40 to +140° C.) atthe temperature increasing speed (+3° C./min).

A table in FIG. 4 shows a relationship between the value of the shearmodulus G′ and the properties. In the column of stickiness and falling,a case without stickiness and peeling or falling off is shown by Yes,and a case with stickiness and peeling or falling off is shown by No. Inthe column of adhesion, a case without any problem in adhesion to anobject to be adhered to is shown by Yes, and a case with poor adhesioncausing peeling is shown by No. The value of the shear modulus G′ may bechanged, for example, by changing the length of an alkyl group in anester bond portion of acrylic.

The experimental results in the table show that with the value of theshear modulus G′ of the photocurable adhesive layer being within 3×10⁵Pa≤G′≤3×10⁷ Pa, stickiness and peeling or falling off can be eliminated,and also an adhesive layer having hardness with no problem in adhesioncan be obtained.

Now, based on the experimental results, a method for producing the cover30 in FIGS. 2 and 3A will be described in detail according to the orderof steps.

(1) The design part is partially printed on the substrate.

(2) The substrate and the film are bonded to each other with thephotocurable adhesive layer interposed therebetween to fabricate aprecursor laminate. The photocurable adhesive layer includes,specifically, thermal crosslinking of (meta)acrylic polymer formed of afirst reaction site selected from a first group consisting of a hydroxylgroup, a carboxyl group, and an amino group, and a second reaction siteselected from a second group consisting of an isocyanate group, an epoxygroup, and a metal atom. The photocurable adhesive layer is an adhesivesheet, and the adhesion thereof bonds the substrate and the filmtogether.

(3) Light is applied to the photocurable adhesive layer to change theprecursor laminate into the laminate thereby. The light is applied tothe photocurable adhesive layer through the film on which no design partis formed. Such a photocurable adhesive layer is generally of anultraviolet curable type, and for example, ultraviolet light having awavelength λ of 365 nm is applied. The ultraviolet light is applied tocure the photocurable adhesive layer such that the shear modulus G′ ofthe photocurable adhesive layer measured under the measurement conditionof the temperature of 25° C. and the frequency of 1 Hz reaches a valuewithin a range of 3×10⁵ Pa≤G′≤3×10⁷ Pa.

(4) The laminate fabricated by curing the photocurable adhesive layer asdescribed above is cut in a thickness direction. By this cutting step,the laminate is formed into the laminate 34 in FIG. 3A. Specifically,end surfaces of the laminate 34 are flush end surfaces includingrespective cut surfaces of the film 33, the adhesive layer 32, and thesubstrate 31 as end surfaces 34 a, 34 b in FIG. 3A. The shaped flush endsurfaces also include a cut surface of the design part 35. If thethickness of the adhesive layer 32 exceeds 30 μm, stickiness and peelingor falling starts to occur, and thus the thickness is set to 30 μm orless. On the other hand, if the thickness is less than 10 μm, pooradhesion starts to occur, and thus the thickness is set to 10 μm ormore. Therefore, the thickness is preferably set to 10 to 30 μm.

The cover 30 is completed by the above steps.

The light can be applied to the photocurable adhesive layer to cure thephotocurable adhesive layer, and the value of the shear modulus G′ canbe within 3×10⁵ Pa≤G′≤3×10⁷ Pa as described above by (meta)acrylicpolymer being crosslinked with multifunctional (meta)acrylate, in otherwords, by the fact that (meta)acrylic polymer includes thermalcrosslinking (a first type of crosslinking) and also a second type ofcrosslinking (crosslinking including photocrosslinking) formed byaddition polymerization of unsaturated double bond, and that the twotypes of crosslinking are combined to form an interpenetrating polymernetwork.

From this point, as a condition definition of the adhesive layer 32(cured adhesive layer) of the laminate 34,

instead of the definition that the adhesive layer 32 contains(meta)acrylic polymer crosslinked with multifunctional (meta)acrylate,and the shear modulus G′ measured under the conditions of thetemperature of 25° C. and the frequency of 1 Hz is within 3×10⁵Pa≤G′≤3×10⁷ Pa,

it may be defined that the adhesive layer 32 includes both the firsttype of crosslinking (thermal crosslinking) formed of the first reactionsite and the second reaction site of (meta)acrylic polymer, and thesecond type of crosslinking (crosslinking including photocrosslinking)formed by addition polymerization of unsaturated double bond of (meta)acrylic polymer.

In the example described above, the light blocking design part 35 ispartially formed by printing on a surface of the substrate 31 oppositeto a surface facing the film 33 (a surface opposite to a surface to bebonded to the film 33). However, the design part 35 may be partiallyformed on a surface of the film 33 facing the substrate 31 (a surface tobe bonded to the substrate 31). The design part 35 is provided on eitherthe surface of the film 33 facing the substrate 31 or the surface of thesubstrate 31 opposite to the surface facing the film 33.

FIG. 3B shows a cover 30′ in which the design part 35 is formed on thesurface of the film 33 facing the substrate 31. Components correspondingto those in FIG. 3A are denoted by the same reference numerals. As inFIG. 3A, thicknesses of components are exaggerated.

In the configuration in FIG. 3B, light (ultraviolet light) is applied tothe photocurable adhesive layer through the substrate on which no designpart is formed to cure the photocurable adhesive layer. For such aconfiguration without a design part, a direction of applying the lightto the photocurable adhesive layer is not particularly limited.

The optical component and the method for producing the optical componentaccording to the present invention have been described taking the coverprovided on the contact input surface of the touch sensor as an example.The adhesive layer bonds the film and the substrate together and is thenmoderately cured by application of the light. Thus, the adhesive layercan be more easily cut than a layer of an uncured adhesive, therebyallowing the cover including the end surfaces of the film, the adhesivelayer, and the substrate flush with each other to be successfullyproduced.

Also, in a subsequent assembling step of a touch sensor device or aproduct including a touch sensor, even if the operator touches the endsurface of the cover, a small piece of the adhesive layer does not peelor fall off from the cut surface of the adhesive layer, or a defect doesnot occur such as foreign matter adhering to the cut surface or the filmbeing peeled from an end. This allows the touch sensor device or theproduct including the touch sensor to be subsequently successfullyassembled.

FIGS. 5 and 6 schematically show cross-sectional structures of the touchsensor device including the cover 30 in FIGS. 2 and 3A. In FIG. 5,reference numeral 40 denotes the touch sensor, and reference numeral 50denotes a screen display device. In FIG. 6, reference numeral 70 denotesa screen display device including a touch sensor.

In FIG. 5, the cover 30 is joined to the touch sensor 40 with atransparent adhesive layer 61 therebetween, and the touch sensor 40 isjoined to the screen display device 50 with a transparent adhesive layer62 therebetween. In FIG. 6, the cover 30 is joined to the screen displaydevice 70 including a touch sensor with a transparent adhesive layer 63therebetween.

Such a cover provided on the contact input surface of the touch sensoroften requires an ultraviolet absorbing function to prevent componentsin the touch sensor device from being exposed to ultraviolet light anddeteriorated with time, and further to protect the film 33 and thesubstrate 31 themselves that constitute the laminate 34 from beingdeteriorated by ultraviolet light.

The film 33 is often a functional film having an antiscattering functionand also an antireflection performance. Also in that case, the filmoften has high transmittance for a visible light range and lowtransmittance of ultraviolet light.

In those cases, if the photocurable adhesive layer is a generalultraviolet curable adhesive layer as described above, curing byapplication of light cannot be successfully performed. In the presentinvention, the photocurable adhesive layer can be successfully cured inthose cases.

At least one of the substrate 31 and the film 33 contains an ultravioletabsorbing agent, or at least one of the substrate 31 and the film 33 haslight transmittance of less than 50% for a light wavelength range of 350to 390 nm and 50% or more for a light wavelength range of 390 to 750 nm.Specifically, at least one of the substrate 31 and the film 33 has anultraviolet screening effect. In this case, the ultraviolet curableadhesive layer cannot be successfully cured

a) if the design part 35 is formed on the substrate 31 and at least thefilm 33 has the ultraviolet screening effect,

b) if the design part 35 is formed on the film 33 and at least thesubstrate 31 has the ultraviolet screening effect, and

c) if the design part 35 is not formed but both the film 33 and thesubstrate 31 have the ultraviolet screening effect. Thus, for thesethree cases, the photocurable adhesive layer contains a light radicalgenerator that reacts with certain wavelength component light within alight wavelength range of 390 to 450 nm and (meta)acrylic polymer, andthe light applied to the photocurable adhesive layer in a step of curingthe photocurable adhesive layer includes the wavelength component light.

Such a photocurable adhesive layer can be used to successfully cure theadhesive layer even if the substrate 31 and/or the film 33 has theultraviolet screening effect. As the light radical generator that reactswith the certain wavelength component light within the light wavelengthrange of 390 to 450 nm as described above, for example, an acylphosphineoxide light radical generator may be used. Also, a metal halide lamp orthe like may be used as a light source for applying the light within thelight wavelength range to the adhesive layer.

The present invention has been described above taking the cover disposedin the contact input surface of the touch sensor as an example. However,the optical component according to the present invention is not limitedto the exemplified cover, but may be applied to an object composed of alaminate including a transparent substrate, a transparent adhesivelayer, and a transparent film stacked in this order.

What is claimed is:
 1. A method for producing an at least partiallytransparent optical component including a laminate, comprising: a stepof fabricating a precursor laminate by bonding a transparent substrateand a transparent film to each other with a transparent photocurableadhesive layer interposed therebetween; a step of curing the transparentphotocurable adhesive layer by applying light thereto to change theprecursor laminate into the laminate thereby, such that a shear modulusG′ of the transparent photocurable adhesive layer of the laminatemeasured under a condition of a temperature of 25° C. and a frequency of1 Hz reaches a value within a range of 3×10⁵ Pa≤G′≤3×10⁷ Pa; and a stepof forming a flush end surface of the laminate by cutting the laminatein a thickness direction, such that the flush end surface includesrespective cut surfaces of the transparent film, the transparentphotocurable adhesive layer, and the transparent substrate.
 2. Themethod for producing the optical component according to claim 1, furthercomprising, before the step of fabricating the precursor laminate, astep of partially printing a light blocking design part on one of asurface of the transparent film to be bonded to the transparentsubstrate and a surface of the transparent substrate opposite to asurface to be bonded to the transparent film, wherein in the step ofcuring the transparent photocurable adhesive layer, the light is appliedto the transparent photocurable adhesive layer through one of thetransparent film and the transparent substrate on which the lightblocking design part is not printed; and the flush end surface formed inthe step of forming the flush end surface of the laminate furtherincludes a cut surface of the light blocking design part.
 3. The methodfor producing the optical component according to claim 2, wherein theone of the transparent film and the transparent substrate on which thelight blocking design part is not printed contains an ultravioletabsorbing agent; the transparent photocurable adhesive layer contains alight radical generator that reacts with a certain wavelength componentlight within a light wavelength range of 390 to 450 nm and (meta)acrylicpolymer; and the light applied to the transparent photocurable adhesivelayer in the step of curing the transparent photocurable adhesive layerincludes the certain wavelength component light.
 4. The method forproducing the optical component according to claim 2, wherein the one ofthe transparent film and the transparent substrate on which the lightblocking design part is not printed has a light transmittance of lessthan 50% for a light wavelength range of 350 to 390 nm and 50% or morefor a light wavelength range of 390 to 750 nm; the transparentphotocurable adhesive layer contains a light radical generator thatreacts with a certain wavelength component light within a lightwavelength range of 390 to 450 nm and (meta)acrylic polymer; and thelight applied to the transparent photocurable adhesive layer in the stepof curing the transparent photocurable adhesive layer includes thecertain wavelength component light.
 5. A method for producing a productincluding a touch sensor, comprising a step of bonding the opticalcomponent produced by the method for producing the optical componentaccording to 1 and the touch sensor or a device including the touchsensor to each other with another transparent adhesive layer interposedtherebetween.
 6. An optical component comprising a laminate, thelaminate including a transparent substrate, a transparent adhesivelayer, and a transparent film stacked in this order, wherein thetransparent adhesive layer includes both a first type of crosslinkingand a second type of crosslinking of (meta)acrylic polymer, the firsttype of crosslinking being formed of a first reaction site selected froma first group consisting of: a hydroxyl group, a carboxyl group, and anamino group, and a second reaction site selected from a second groupconsisting of: an isocyanate group, an epoxy group, and a metal atom,and the second type of crosslinking being formed by additionpolymerization of unsaturated double bond; and an end surface of thelaminate includes respective cut surfaces of the transparent film, thetransparent adhesive layer, and the transparent substrate flush witheach other.
 7. The optical component according to claim 6, wherein atleast one of the transparent substrate and the transparent film containsan ultraviolet absorbing agent.
 8. The optical component according toclaim 6, wherein at least one of the transparent substrate and thetransparent film has a light transmittance of less than 50% for a lightwavelength range of 350 to 390 nm and 50% or more for a light wavelengthrange of 390 to 750 nm.
 9. The optical component according to claim 6,wherein a light blocking design part is partially formed on one of asurface of the transparent film facing the transparent substrate and asurface of the transparent substrate opposite to a surface facing thetransparent film; and the end surface of the laminate further includes acut surface of the light blocking design part in a flush manner.
 10. Theoptical component according to claim 9, wherein at least one of thetransparent substrate and the transparent film contains an ultravioletabsorbing agent.
 11. The optical component according to claim 9, whereinat least one of the transparent substrate and the transparent film has alight transmittance of less than 50% for a light wavelength range of 350to 390 nm and 50% or more for a light wavelength range of 390 to 750 nm.12. An optical component comprising a laminate, the laminate including atransparent substrate, a transparent adhesive layer, and a transparentfilm stacked in this order, wherein the transparent adhesive layercontains (meta)acrylic polymer crosslinked with multifunctional(meta)acrylate; a shear modulus G′ of the transparent adhesive layermeasured under a condition of a temperature of 25° C. and a frequency of1 Hz is within 3×10⁵ Pa≤G′≤3×10⁷ Pa; and an end surface of the laminateincludes respective cut surfaces of the transparent film, thetransparent adhesive layer, and the transparent substrate flush witheach other.
 13. The optical component according to claim 12, wherein atleast one of the transparent substrate and the transparent film containsan ultraviolet absorbing agent.
 14. The optical component according toclaim 12, wherein at least one of the transparent substrate and thetransparent film has a light transmittance of less than 50% for a lightwavelength range of 350 to 390 nm and 50% or more for a light wavelengthrange of 390 to 750 nm.
 15. The optical component according to claim 12,wherein a light blocking design part is partially formed on one of asurface of the transparent film facing the transparent substrate and asurface of the transparent substrate opposite to a surface facing thetransparent film; and the end surface of the laminate further includes acut surface of the light blocking design part in a flush manner.
 16. Theoptical component according to claim 15, wherein at least one of thetransparent substrate and the transparent film contains an ultravioletabsorbing agent.
 17. The optical component according to claim 15,wherein at least one of the transparent substrate and the transparentfilm has a light transmittance of less than 50% for a light wavelengthrange of 350 to 390 nm and 50% or more for a light wavelength range of390 to 750 nm.
 18. A touch sensor device comprising a structure in whichthe optical component according to claim 6 and a touch sensor or adevice including a touch sensor are joined to each other with anothertransparent adhesive layer interposed therebetween.
 19. A touch sensordevice comprising a structure in which the optical component accordingto claim 12 and a touch sensor or a device including a touch sensor arejoined to each other with another transparent adhesive layer interposedtherebetween.